Yeah, Eye-Fi (the company) doesn't exist anymore, probably because newer cameras all have wifi. But for a photobooth at a party that needs to run unattended, it's better to use an old camera you don't care about too much ;-)
Having gphoto monitor the camera constantly (my first attempt) is not a good solution, because if for whatever reason the connection to the camera is lost, gphoto just dies.
In my current setup, gphoto downloads new files at regular intervals (via cron), puts them in a directory on the pi, which is then rsynced to a server. This is very resilient: it survives rebooting the pi, turning the camera off or on, etc., with zero intervention. All it needs is a network connection to the Pi (wifi or ethernet) and nothing else. No app, no phone nearby, no bluetooth, no nothing ;-)
I use an old Pi 3 for this that's plenty fast; it would probably work on a zero (but I've never been able to buy one) or other single boards. Ideally it could be put in a small box that could be mounted on the flash shoe and that would also act as a remote...
Having gphoto monitor the camera constantly (my first attempt) is not a good solution, because if for whatever reason the connection to the camera is lost, gphoto just dies.
In my current setup, gphoto downloads new files at regular intervals (via cron), puts them in a directory on the pi, which is then rsynced to a server. This is very resilient: it survives rebooting the pi, turning the camera off or on, etc., with zero intervention. All it needs is a network connection to the Pi (wifi or ethernet) and nothing else. No app, no phone nearby, no bluetooth, no nothing ;-)
I use an old Pi 3 for this that's plenty fast; it would probably work on a zero (but I've never been able to buy one) or other single boards. Ideally it could be put in a small box that could be mounted on the flash shoe and that would also act as a remote...